10p+coroana+multumesc

10pcoroanamultumesc class=

Răspuns :

A={x€|N| 14\x-3€|N}
n€D14={1,2,7,14}

x-3=1=>x=4€|N
x-3=2=>x=5€|N
x-3=7=>x=10€|N
x-3=14=>x=17€|N

B={x€|N| 1/4<x/5<3/2}
1\4<x/5<3/2=1,2,4,5

AnB={4,5}

SUCCES!